Has nothing to do with speed. I'm using OK3, and when it happens to me, I'm just going through 1 line item at a time slowly, reading what's playing. Nothing too fast seriously (getting too old to read too fast anyhow)
Usually it is less than 1 line per second, and the EPG is already located for that screenfull, so it is not like I interrupt any loading process or something. Never had those issues pre-211.
Anyhow, it is a little annoying, but can live with it. It's strange that video and audio are still playing, but nothing else responds.. Only OS interrupts (HOME, and Volume if i remember correctly).